Dave,
I've shared your suffering. Plumbing isn't my favourite DIY activity, much prefer electricity!
The Tonneau pole sounds good:I run Aldermog with the Williams Wind deflector, so on each side there are the mounting points that cry out to be used to take a "micto tonneau pole" to cover the folded hood and the space behind the seats.
I don't want to butcher the full mohair tonneau, so any suggestions as to where I could get one made?